Abstract
Purpose
Axitinib is a potent and selective inhibitor of vascular endothelial growth factor receptors 1–3, approved for second-line treatment of advanced renal cell carcinoma (RCC). Preclinical studies did not indicate potential for axitinib-induced delayed cardiac repolarization.
Methods
The effect of axitinib on corrected QT (QTc) prolongation was evaluated with one-stage concentration–QTc response modeling using data from a definitive randomized crossover QT phase I study in healthy volunteers administered one single 5-mg axitinib dose alone or in the presence of steady-state ketoconazole (400 mg once daily).
Results
Axitinib and ketoconazole had opposite effects on heart rate: Axitinib lowered it, ketoconazole raised it. The final analysis showed a flat relationship between QTc and axitinib concentration (slope −0.0314 ms·mL/ng) for axitinib alone. Mean highest placebo-matched change from baseline in QTc was −3.0 [90 % confidence interval (CI) −5.4, −0.6] ms. At supratherapeutic axitinib exposures achieved with potent cytochrome P450 3A4/5 inhibition by ketoconazole, the model predicted mean QTc change of 6.5 (90 % CI 4.4–8.5) ms. The slope population mean estimate was −0.331 (95 % CI −0.860, 0.198) ms·mL/µg for ketoconazole alone and 0.0725 (0.0445–0.1005) ms·mL/ng for axitinib in the presence of ketoconazole. The results were then compared with those obtained based on more widely used Fridericia’s, Bazett’s, and study-specific correction methods.
Conclusions
Since axitinib plasma concentrations observed in this study exceeded the range of concentrations observed in patients with RCC at the highest approved clinical dose (10 mg twice daily), axitinib was not associated with clinically significant QTc prolongation in target populations.
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Acknowledgments
This study was sponsored by Pfizer Inc. Medical writing support was funded by Pfizer Inc and provided by Mariko Nagashima, PhD, of Engage Scientific Solutions (Southport, CT, USA).
Conflict of interest
Ana Ruiz-Garcia, Brett E. Houk, and Yazdi K. Pithavala are employees of and own stock in Pfizer Inc. Michael A. Tortorici, who was employed by and owned stock in Pfizer Inc during the time of this study and development of the manuscript, is currently an employee of CSL Behring Biotherapies for Life™. Melvin Toh, who was employed by and owned stock/options in Pfizer Inc at the time of this study, is currently an employee of CK Life Sciences Int’l. (Holdings) Inc and no longer owns stock/options in Pfizer Inc. Nenad Sarapa, who was employed by and owned stock/options in Pfizer Inc at the time of this study, is currently employed by Bayer Healthcare Pharmaceuticals.
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M. A. Tortorici was employed at Pfizer Inc during the time of this study and development of the manuscript.
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Ruiz-Garcia, A., Houk, B.E., Pithavala, Y.K. et al. Effect of axitinib on the QT interval in healthy volunteers. Cancer Chemother Pharmacol 75, 619–628 (2015). https://doi.org/10.1007/s00280-015-2677-z
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DOI: https://doi.org/10.1007/s00280-015-2677-z